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CNPS Rare Plant Inventory


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51 matches found. Click on scientific name for details

Search Criteria: Common Name starts with O

Scientific Name Common Name Family Lifeform Blooming Period Fed List State List Global Rank State Rank CA Rare Plant Rank Other Status Threats General Habitats Microhabitats Lowest Elevation (m) Highest Elevation (m) Lowest Elevation (ft) Highest Elevation (ft) CA Endemic Date Added Photo
Arctostaphylos otayensis Otay manzanita Ericaceae perennial evergreen shrub Jan-Apr None None G1 S1 1B.2 BLM_S; SB_CalBG/RSABG; SB_CRES Altered flood/tidal/hydrologic regime, Development, Foot traffic/trampling, Improper burning regime, Non-native plant impacts, Other, Recreational use (non-ORV), Road/trail construction/maint. Chaparral, Cismontane woodland 275 1700 900 5580 Yes 1974-01-01
No Photo Available
Calochortus umbellatus Oakland star-tulip Liliaceae perennial bulbiferous herb Mar-May None None G3? S3? 4.2 SB_UCBG Broadleafed upland forest, Chaparral, Cismontane woodland, Lower montane coniferous forest, Valley and foothill grassland Serpentine (often) 100 700 330 2295 Yes 1980-01-01
No Photo Available
Antirrhinum ovatum oval-leaved snapdragon Plantaginaceae annual herb May-Nov None None G3 S3 4.2 Agriculture, Development, Grazing, Non-native plant impacts, Road/trail construction/maint. Chaparral, Cismontane woodland, Pinyon and juniper woodland, Valley and foothill grassland Alkaline (often), Clay (sometimes) 200 1000 655 3280 Yes 1974-01-01 Photo of Antirrhinum ovatum
© 2013 Chris Winchell
Dudleya attenuata ssp. attenuata Orcutt's dudleya Crassulaceae perennial herb May-Jul None None G4T1T2 S1 2B.1 SB_CalBG/RSABG Development, Foot traffic/trampling, Military operations, Recreational use (non-ORV), Road/trail construction/maint. Chaparral, Coastal bluff scrub, Coastal scrub Gravelly (sometimes), Rocky (sometimes) 3 50 10 165 1974-01-01
No Photo Available
Deinandra conjugens Otay tarplant Asteraceae annual herb (Apr)May-Jun FT CE G1 S1 1B.1 SB_CalBG/RSABG; SB_CRES Altered flood/tidal/hydrologic regime, Development, Erosion/runoff, Foot traffic/trampling, Grazing, Improper burning regime, Non-native animal impacts, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter, Wood cutting or brush clearing Coastal scrub, Valley and foothill grassland Clay 25 300 80 985 1974-01-01
No Photo Available
Dicranostegia orcuttiana Orcutt's bird's-beak Orobanchaceae annual herb (hemiparasitic) (Mar)Apr-Jul(Sep) None None G2G3 S1 2B.1 SB_CRES Development, Mining, Non-native plant impacts, Road/trail construction/maint. Coastal scrub 10 350 35 1150 1974-01-01
No Photo Available
Arabis oregana Oregon rockcress Brassicaceae perennial herb May None None G3G4Q S3 4.3 Chaparral, Lower montane coniferous forest Serpentine 600 1830 1970 6005 1974-01-01 Photo of Arabis oregana
©2021 Scot Loring
Hazardia orcuttii Orcutt's hazardia Asteraceae perennial evergreen shrub Aug-Oct None CT G1 S1 1B.1 SB_CalBG/RSABG Development, Erosion/runoff, Foot traffic/trampling, Improper burning regime, Insufficient population/stand size, Non-native plant impacts, ORV activity, Recreational use (non-ORV) Chaparral (maritime), Coastal scrub Clay (often) 80 85 260 280 1984-01-01 Photo of Hazardia orcuttii
© 2011 Keir Morse
Brodiaea orcuttii Orcutt's brodiaea Themidaceae perennial bulbiferous herb May-Jul None None G2 S2 1B.1 BLM_S; SB_CRES; USFS_S Agriculture, Altered flood/tidal/hydrologic regime, Dam/Inundation, Development, Erosion/runoff, Foot traffic/trampling, Grazing, Improper burning regime, Military operations, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Surface water diversion, Vandalism/dumping/litter, Wood cutting or brush clearing Chaparral, Cismontane woodland, Closed-cone coniferous forest, Meadows and seeps, Valley and foothill grassland, Vernal pools Clay, Mesic 30 1692 100 5550 Yes 1974-01-01 Photo of Brodiaea orcuttii
© 2001 Ellen Friedman & Ted Dunning
Carex halliana Oregon sedge Cyperaceae perennial rhizomatous herb (May)Jul-Sep None None G4G5 S2 2B.3 Foot traffic/trampling, Improper burning regime, Logging, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Wood cutting or brush clearing Meadows and seeps, Subalpine coniferous forest, Upper montane coniferous forest 1370 2105 4495 6905 1980-01-01 Photo of Carex halliana
©2010 Keir Morse
Chorizanthe orcuttiana Orcutt's spineflower Polygonaceae annual herb Mar-May FE CE G1 S1 1B.1 SB_CalBG/RSABG Development, Erosion/runoff, Foot traffic/trampling, Improper burning regime, Non-native plant impacts, Recreational use (non-ORV), Road/trail construction/maint. Chaparral (maritime), Closed-cone coniferous forest, Coastal scrub Openings, Sandy 3 125 10 410 Yes 1980-01-01
No Photo Available
Dalea ornata ornate dalea Fabaceae perennial herb Jun None None G4G5 S2 2B.1 BLM_S; IUCN_LC Development, Grazing, Non-native plant impacts, Road/trail construction/maint. Pinyon and juniper woodland (clay, rocky) 1365 1700 4480 5580 1988-01-01
No Photo Available
Dicentra formosa ssp. oregana Oregon bleeding heart Papaveraceae perennial herb Apr-May None None G5T4 S3 4.2 Lower montane coniferous forest (serpentinite) 425 1485 1395 4870 1974-01-01 Photo of Dicentra formosa ssp. oregana
©2008 Keir Morse
Epilobium oreganum Oregon fireweed Onagraceae perennial herb Jun-Sep None None G2 S2 1B.2 SB_CalBG/RSABG; USFS_S Altered flood/tidal/hydrologic regime, Foot traffic/trampling, Grazing, Other, Recreational use (non-ORV), Road/trail construction/maint. Bogs and fens, Lower montane coniferous forest, Meadows and seeps, Upper montane coniferous forest Mesic 500 2240 1640 7350 1980-01-01 Photo of Epilobium oreganum
© 2015 Steve Matson
Iris tenax ssp. klamathensis Orleans iris Iridaceae perennial rhizomatous herb Apr-May None None G4G5T4 S4 4.3 Lower montane coniferous forest (often disturbed areas) 100 1400 330 4595 Yes 1974-01-01 Photo of Iris tenax ssp. klamathensis
© 2012 Dana York
Pogogyne nudiuscula Otay Mesa mint Lamiaceae annual herb May-Jul FE CE G1 S1 1B.1 SB_CalBG/RSABG Agriculture, Development, Disking, Foot traffic/trampling, Grazing, Non-native plant impacts, ORV activity, Other, Road/trail construction/maint., Vandalism/dumping/litter, Wood cutting or brush clearing Vernal pools 90 250 295 820 1974-01-01
No Photo Available
Lewisia oppositifolia opposite-leaved lewisia Montiaceae perennial herb Apr-May(Jun) None None G3 S2 2B.2 USFS_S Mining, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint. Lower montane coniferous forest (mesic) 300 1220 985 4005 1974-01-01 Photo of Lewisia oppositifolia
© 2013 Scot Loring
Salvia greatae Orocopia sage Lamiaceae perennial evergreen shrub Mar-Apr None None G2G3 S2S3 1B.3 BLM_S; SB_CalBG/RSABG Foot traffic/trampling, Military operations, ORV activity, Other, Recreational use (non-ORV) Mojavean desert scrub, Sonoran desert scrub -40 825 -130 2705 Yes 1974-01-01
No Photo Available
Eriogonum wrightii var. olanchense Olancha Peak buckwheat Polygonaceae perennial herb Jul-Sep None None G5T2 S2 1B.3 SB_CalBG/RSABG; USFS_S Other Alpine boulder and rock field, Subalpine coniferous forest (gravelly, rocky) 3260 3535 10695 11600 Yes 1974-01-01
No Photo Available
Fritillaria ojaiensis Ojai fritillary Liliaceae perennial bulbiferous herb Feb-May None None G3 S3 1B.2 SB_SBBG; USFS_S Development, Erosion/runoff, Other, Recreational use (non-ORV), Road/trail construction/maint., Wood cutting or brush clearing Broadleafed upland forest (mesic), Chaparral, Cismontane woodland, Lower montane coniferous forest Rocky 225 998 740 3275 Yes 1980-01-01 Photo of Fritillaria ojaiensis
© 2010 David Magney
Galium angustifolium ssp. onycense Onyx Peak bedstraw Rubiaceae perennial herb Apr-Jul None None G5T3 S3 1B.3 BLM_S; SB_CalBG/RSABG Cismontane woodland, Pinyon and juniper woodland Granitic, Rocky 860 2300 2820 7545 Yes 1974-01-01 Photo of Galium angustifolium ssp. onycense
© 2020 Cheryl Birker
Galium oreganum Oregon bedstraw Rubiaceae perennial rhizomatous herb May-Sep None None G4G5 S1S2 3 Lower montane coniferous forest, North Coast coniferous forest 1500 1500 4920 4920 1974-01-01 Photo of Galium oreganum
© 2021 Scot Loring
Linanthus orcuttii Orcutt's linanthus Polemoniaceae annual herb May-Jun None None G3 S2 1B.3 SB_CalBG/RSABG; USFS_S Erosion/runoff, Foot traffic/trampling, Grazing, Logging, Recreational use (non-ORV), Road/trail construction/maint. Chaparral, Lower montane coniferous forest, Pinyon and juniper woodland Openings 915 2145 3000 7040 1974-01-01
No Photo Available
Lomatium shevockii Owens Peak lomatium Apiaceae perennial herb Apr-May None None G2 S2 1B.2 BLM_S; SB_CalBG/RSABG Lower montane coniferous forest, Upper montane coniferous forest Rocky 1770 2535 5805 8315 Yes 1988-01-01
No Photo Available
Hosackia crassifolia var. otayensis Otay Mountain lotus Fabaceae perennial herb May-Aug None None G5T1 S1 1B.1 BLM_S; SB_CalBG/RSABG; SB_CRES Road/trail construction/maint. Chaparral (metavolcanic, often disturbed areas) 380 1005 1245 3295 1984-01-01 Photo of Hosackia crassifolia var. otayensis
© 2020 Keir Morse
Lupinus citrinus var. citrinus orange lupine Fabaceae annual herb Apr-Jul None None G2T2 S2 1B.2 SB_SBBG; USFS_S Agriculture, Biocides, Development, Foot traffic/trampling, Grazing, Logging, Non-native plant impacts, ORV activity, Other, Over-collecting/poaching, Recreational use (non-ORV), Road/trail construction/maint. Chaparral, Cismontane woodland, Lower montane coniferous forest Granitic 380 1700 1245 5580 Yes 1974-01-01
No Photo Available
Mimulus subsecundus one-sided monkeyflower Phrymaceae annual herb May-Jul None None G3G4Q S2? 4.3 Chaparral, Lower montane coniferous forest 450 915 1475 3000 Yes 1974-01-01
No Photo Available
Nemophila parviflora var. quercifolia oak-leaved nemophila Hydrophyllaceae annual herb May-Jun None None G5T4 S4 4.3 Cismontane woodland, Lower montane coniferous forest 700 2200 2295 7220 1980-01-01
No Photo Available
Ivesia baileyi var. beneolens Owyhee ivesia Rosaceae perennial herb Jun None None G5T4 S1 2B.3 Pinyon and juniper woodland, Upper montane coniferous forest Rocky, Volcanic 2150 2150 7055 7055 1994-01-01 Photo of Ivesia baileyi var. beneolens
© 1990 Dean Wm. Taylor
Mertensia bella Oregon bluebells Boraginaceae perennial herb May-Jul None None G4 S1 2B.2 Meadows and seeps, Upper montane coniferous forest Disturbed areas (often), Mesic, Openings (often) 1500 2000 4920 6560 1994-01-01 Photo of Mertensia bella
Dan Post (1997)
Eriogonum ochrocephalum var. ochrocephalum ochre-flowered buckwheat Polygonaceae perennial herb May-Jun None None G5T2T3 S2 2B.2 Mining Great Basin scrub, Pinyon and juniper woodland Clay (sometimes), Volcanic (sometimes) 1200 2410 3935 7905 2001-01-01
No Photo Available
Sidalcea covillei Owens Valley checkerbloom Malvaceae perennial herb Apr-Jun None CE G2 S2 1B.1 BLM_S; SB_SBBG Altered flood/tidal/hydrologic regime, Dam/Inundation, Development, Foot traffic/trampling, Grazing, Groundwater pumping, Non-native plant impacts, ORV activity, Other, Road/trail construction/maint., Vandalism/dumping/litter Chenopod scrub, Meadows and seeps Alkaline, Mesic 1095 1415 3595 4645 Yes 1974-01-01 Photo of Sidalcea covillei
© 2001 Larry Blakely
Engellaria obtusa obtuse starwort Caryophyllaceae perennial rhizomatous herb May-Sep(Oct) None None G5 S4 4.3 Grazing, Logging, Mining, Recreational use (non-ORV), Road/trail construction/maint. Lower montane coniferous forest, Riparian woodland, Upper montane coniferous forest Mesic, Streambanks 150 2290 490 7515 1988-01-01 Photo of Engellaria obtusa
©2014 Kirsten Bovee
Xylorhiza orcuttii Orcutt's woody-aster Asteraceae perennial herb Mar-Apr None None G3? S3 1B.2 BLM_S; SB_CalBG/RSABG ORV activity, Other, Over-collecting/poaching, Road/trail construction/maint., Vandalism/dumping/litter Sonoran desert scrub 0 365 0 1200 1974-01-01
No Photo Available
Arctostaphylos osoensis Oso manzanita Ericaceae perennial evergreen shrub Feb-Mar None None G1 S1 1B.2 SB_UCSC Chaparral, Cismontane woodland 95 500 310 1640 Yes 1994-01-01
No Photo Available
Lilium humboldtii ssp. ocellatum ocellated Humboldt lily Liliaceae perennial bulbiferous herb Mar-Jul(Aug) None None G4T4? S4? 4.2 SB_CalBG/RSABG; SB_CRES Chaparral, Cismontane woodland, Coastal scrub, Lower montane coniferous forest, Riparian woodland Openings 30 1800 100 5905 Yes 1980-01-01 Photo of Lilium humboldtii ssp. ocellatum
© 2008 Thomas Stoughton
Stylocline citroleum oil neststraw Asteraceae annual herb Mar-Apr None None G3 S3 1B.1 BLM_S Altered flood/tidal/hydrologic regime, Mining, Other, Road/trail construction/maint. Chenopod scrub, Coastal scrub, Valley and foothill grassland Clay 50 400 165 1310 Yes 1994-01-01
No Photo Available
Astragalus nuttallii var. nuttallii ocean bluff milk-vetch Fabaceae perennial herb Jan-Nov None None G4T4 S4 4.2 SB_UCSC Coastal bluff scrub, Coastal dunes 3 120 10 395 Yes 2001-01-01
No Photo Available
Castilleja litoralis Oregon coast paintbrush Orobanchaceae perennial herb (hemiparasitic) Jun None None G3 S3 2B.2 Erosion/runoff, Foot traffic/trampling, Non-native plant impacts, Other, Recreational use (non-ORV), Road/trail construction/maint. Coastal bluff scrub, Coastal dunes, Coastal scrub Sandy 15 100 50 330 2001-01-01 Photo of Castilleja litoralis
©2010 Dana York
Ceanothus otayensis Otay Mountain ceanothus Rhamnaceae perennial evergreen shrub Jan-Apr None None G1G2 S1 1B.2 BLM_S; SB_CalBG/RSABG; SB_CRES Foot traffic/trampling, Improper burning regime, Other, Road/trail construction/maint. Chaparral (gabbroic, metavolcanic) 600 1100 1970 3610 2001-01-01
No Photo Available
Chaenactis glabriuscula var. orcuttiana Orcutt's pincushion Asteraceae annual herb Jan-Aug None None G5T1 S1 1B.1 SB_CalBG/RSABG; SB_CRES Development, Foot traffic/trampling, Non-native plant impacts, Other, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter Coastal bluff scrub (sandy), Coastal dunes 0 100 0 330 2001-01-01
No Photo Available
Meconella oregana Oregon meconella Papaveraceae annual herb Mar-Apr None None G2G3 S2 1B.1 SB_CalBG/RSABG Coastal prairie, Coastal scrub 250 620 820 2035 1974-01-01 Photo of Meconella oregana
© 2021 Scot Loring
Silene oregana Oregon campion Caryophyllaceae perennial herb Jul-Sep None None G4 S3 2B.2 Foot traffic/trampling, Grazing, Logging, Recreational use (non-ORV), Road/trail construction/maint. Great Basin scrub, Subalpine coniferous forest 1500 2500 4920 8205 2001-01-01 Photo of Silene oregana
©2019 Matt C. Berger
Viburnum ellipticum oval-leaved viburnum Viburnaceae perennial deciduous shrub May-Jun None None G4G5 S3 2B.3 Improper burning regime, Non-native plant impacts, Other, Road/trail construction/maint. Chaparral, Cismontane woodland, Lower montane coniferous forest 215 1400 705 4595 1974-01-01 Photo of Viburnum ellipticum
© 2006 Tom Engstrom
Coptis laciniata Oregon goldthread Ranunculaceae perennial rhizomatous herb (Feb)Mar-May(Sep-Nov) None None G4? S3? 4.2 Altered flood/tidal/hydrologic regime, Biocides, Development, Erosion/runoff, Foot traffic/trampling, Grazing, Logging, Other, Road/trail construction/maint., Wood cutting or brush clearing Meadows and seeps, North Coast coniferous forest (streambanks) Mesic 0 1000 0 3280 2006-10-16 Photo of Coptis laciniata
© 2021 Scot Loring
Navarretia ojaiensis Ojai navarretia Polemoniaceae annual herb May-Jul None None G2 S2 1B.1 SB_CalBG/RSABG; USFS_S Development, Road/trail construction/maint., Wood cutting or brush clearing Chaparral (openings), Coastal scrub (openings), Valley and foothill grassland 275 620 900 2035 Yes 2008-05-15
No Photo Available
Polemonium carneum Oregon polemonium Polemoniaceae perennial herb Apr-Sep None None G3G4 S2 2B.2 Logging Coastal prairie, Coastal scrub, Lower montane coniferous forest 0 1830 0 6005 2008-11-03 Photo of Polemonium carneum
©2018 John Doyen
Arctostaphylos ohloneana Ohlone manzanita Ericaceae evergreen shrub Feb-Mar None None G1 S1 1B.1 SB_CalBG/RSABG; SB_USDA Disease, Road/trail construction/maint. Closed-cone coniferous forest, Coastal scrub 450 530 1475 1740 Yes 2009-04-02
No Photo Available
Euphorbia jaegeri Orocopia Mountains spurge Euphorbiaceae perennial shrub Oct-May None None G1 S1 1B.1 BLM_S; SB_CalBG/RSABG Development, Mining, Road/trail construction/maint. Mojavean desert scrub Carbonate, Granitic, Gravelly (sometimes), Metamorphic, Rocky 600 850 1970 2790 Yes 2013-01-17
No Photo Available
Limnanthes douglasii ssp. ornduffii Ornduff's meadowfoam Limnanthaceae annual herb Nov-May None None G4T1 S1 1B.1 SB_UCSC Agriculture, Disking, Non-native plant impacts Meadows and seeps 10 20 35 65 Yes 2014-03-18 Photo of Limnanthes douglasii ssp. ornduffii
© 2021 Eva Buxton
Dendriscocaulon intriculatum olive-thorn lichen CBR 2022-09-20
No Photo Available

Suggested Citation:
California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5). Website https://www.rareplants.cnps.org [accessed 26 April 2024].